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Low noise, low dropout voltage regulator

  • US 8,692,529 B1
  • Filed: 09/19/2011
  • Issued: 04/08/2014
  • Est. Priority Date: 09/19/2011
  • Status: Active Grant
First Claim
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1. A low dropout (LDO) voltage regulator comprising:

  • a scaling amplifier for receiving a bandgap voltage, Vbg, and outputting a scaled Vbg,a reference MOSFET device for reducing the scaled Vbg by a voltage Vgs formed across gate and source nodes of the reference MOSFET device to form a reduced level of the scaled Vbg,an RC network for filtering the reduced level of the scaled Vbg and outputting a filtered voltage, andan output buffer for receiving and increasing the filtered voltage by the voltage Vgs to recover the scaled Vbg,where the scaled Vbg is used as a regulated voltage output, andthe RC network is coupled between the reference MOSFET device and the output buffer.

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